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Search Results: 1 - 10 of 33991 matches for " 贾锦楠 "
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马铃薯对瓜列当种子萌发的化感作用研究
王 钟,马永清,,董淑琦,叶晓馨
中国生态农业学报 , 2013,
Abstract: 瓜列当给瓜类等经济作物造成较大危害。本研究采用盆栽4个推广马铃薯品种"夏波蒂"、"青薯168"、"冀张薯5号"和"克新1号",以不同生长时期(幼苗期、开花期和结薯期)马铃薯根际土、根系和地上部的浸提液(甲醇和水)刺激瓜列当种子萌发,根据发芽率来判定其对瓜列当化感作用的强弱,同时筛选刺激瓜列当发芽率高的品种用于列当杂草的防除。结果表明,马铃薯能刺激瓜列当种子萌发;不同马铃薯品种对瓜列当的化感作用各有差异,随着马铃薯的生长,根际土中化感物质积累不断升高,根系化感作用逐渐减弱,而地上部化感作用逐渐增强。甲醇浸提液刺激瓜列当种子发芽率高于水浸提液,即甲醇浸提化感作用效果较好。"夏波蒂"根系甲醇浸提液刺激瓜列当种子的发芽率在幼苗期最高,为48.5%;而地上部甲醇浸提液处理的发芽率在结薯期最高,为51.2%。可以在瓜列当危害的农田轮作"夏波蒂"5~8年,同时采用马铃薯秸秆还田来减少土壤中瓜列当种子库,达到防除瓜列当危害的目的。
我国生态城市建设的时空演化路径及其发展模式
,
哈尔滨工程大学学报 , 2017, DOI: 10.11990/jheu.201609064
Abstract: 为了深入了解我国生态城市建设情况,更好地把握我国生态城市建设进程,通过对2000~2011年期间我国拟建生态城市的数据收集与分析,发现我国生态城市建设的演化进程具有两个明显特征:我国生态城市建设随着时间推移经历了一个离散-集聚-离散的倒U型空间演化过程;我国生态城市的分布具有明显的空间差异性。同时,根据我国生态城市发展的时空演化路径,提出生态城市建设的四个构建模式――空间散点模式、空间集聚模式、空间溢出模式与空间平衡模式。这四个模式是我国生态城市从无到有的发展过程。本文的研究结果可以加深对我国生态城市建设状况的认识,更好地把握我国生态城市建设的进程,从而为生态城市建设的合理开展提供决策参考。
被忽视的重要教育议题:校服的多重教育功能
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- , 2017, DOI: 10.16382/j.cnki.1000-5560.2017.06.008
Abstract: 摘要 校服具有重要的教育功能,人们对校服所承载的独特教育功能也都寄予厚望。校服蕴含了多重教育功能:一是教育秩序的强化功能,二是良好道德的涵育功能,三是审美追求的化育功能,四是健康心理的培育功能。我国当前的校服教育功能发挥地还并不充分,存在"三多三少"的问题,需要加强质量监管、兜住质量底线,注重校服设计、强化审美化育,助推校服产业、做大民族品牌。
Abstract: School uniforms can serve important educational functions. Looking at the development of school uniforms worldwide, people tend to have high expectations on the unique educational functions of school uniforms. In terms of educational functions, school uniforms have the following multiple functions:a)consolidating educational order, b) nourishing good morality, c) fostering aesthetic pursuit, and d) cultivating a healthy psychology. However, people in China have not given a full play to the educational functions of school uniforms, with the problems of "three surplus and three lacks". Therefore, it is necessary to strengthen supervision over quality assurance, improve the designs of school uniforms and the fostering of aesthetics, as well as promote the industry of school uniforms as a national brand.
Allelopathic effect of potato on Orabanche aegyptiaca Pers. seed germination
马铃薯对瓜列当种子萌发的化感作用研究

WANG Zhong,MA Yong-Qing,JIA Jin-Nan,DONG Shu-Qi,YE Xiao-Xin,
王 钟
,马永清,,董淑琦,叶晓馨

中国生态农业学报 , 2013,
Abstract: Orobanche aegyptiaca is a national-class quarantine species in China which is seriously harmful to melons and other economic crops. In this study, four commercial potato varieties ("Xiabodi", "Qingshu 168", "Jizhangshu No.5" and "Kexin No.1") were planted at a pot experiment, and their rhizosphere soils and plant organs (roots, stems and leaves) sampled at different growth stages (seedling, blossoming and tuber forming stages). Allelopathy potential of extracts (methanol and distilled water) of the above samples was measured in terms of germination rates of O. aegyptiaca seeds treated. The potatoes varieties with O. aegyptiaca seed high germination rates were chosen to prevent and kill off O. aegyptiaca seeds on croplands. The results showed that potato stimulated O. aegyptiaca germination, and the allelopathy potential differed with potato variety. The germination rates of O. aegyptiaca seeds treated with extracts of potato rhizosphere soil increased with potato growth. This suggested that potato secreted O. aegyptiaca germination stimulants at certain period of growth which in turn reduced O. aegyptiaca seed bank in the soil. At seedling stage of potato, the germination rate of O. aegyptiaca seeds treated with 10-fold diluted methanol extracts from potato roots was higher than those from the shoot system. Seeds treated with "Xiabodi" showed the highest germination rate (48.5%). At blossoming stage of potato, the germination rate of O. aegyptiaca seeds treated with 10-fold diluted methanol extracts from stems was highest, followed by those treated with root extracts and leaf extracts. Seeds treated with "Jizhangshu No.5" had the highest germination rate (33.0%). At tuber forming stage of potato, the germination rate of O. aegyptiaca seeds treated with 10-fold diluted methanol extracts from shoot system was higher than those from roots. Also seeds treated with "Xiabodi" gave the highest germination rate (51.2%). While the germination rate of O. aegyptiaca seeds treated with root extracts declined with increasing growth of potato, those treated with aerial part extract increased. This suggested that of O. aegyptiaca germination stimulants in potatoes gradually moved from the root to shoot system. The germination rate of O. aegyptiaca seeds induced by methanol extracts was higher than that induced by water extracts. In other words, methanol extracts had better effects as germination stimulants. Although artificially synthesized analogues had facilitated the germination of parasitic plant seeds, government protocols had limited their field application and dissemination. Other methods for controlling O. aegyptiaca seeds (e.g., artificial weeding, herbicide application, hybridization and transgenic method) for broomrape resistant cultivars had some disadvantages. Using potato to control O. aegyptiaca was therefore a promising strategy that not only reduced and eradicated parasitic weed seed deposition in soils, but also significantly reduced host broo
聚苯胺包覆玻璃鳞片复合物的制备与表征
,梦秋
涂料工业 , 2010,
Abstract: ?采用化学聚合和乳液聚合两种方法制备聚苯胺包覆玻璃鳞片复合物。通过xrd、红外光谱、sem、表面接触角测试、电导率测试、eis等手段对复合材料的结构、形貌和性能进行了表征。结果表明:不同方法制备的聚苯胺包覆玻璃鳞片复合材料在结构、微观形貌和电导率上有较大差别,其中乳液法制备的复合材料,聚苯胺在玻璃鳞片载体上能够生长成较长的纤维,具有较高的结晶度,电导率高达2.281s/cm。最后以之为导电填料,制备环氧防腐导电涂料,经研究表明其具有优异的导静电、防腐性能和机械性能。
基于SIMD技术的可重构去块滤波器结构
,丁勇
华东理工大学学报 , 2012,
Abstract: 由于去块滤波运算数据量庞大的特点以及视频解码实时性的要求,近年来,去块滤波运算的硬件加速器已逐渐成为研究的热点。从兼顾系统的灵活性与性能的角度出发,设计了一种可重构去块滤波器。与传统的支持单一标准的去块滤波硬件加速器相比,该滤波器具有以下优点:实现了一种滤波算法可配置的滤波器结构,从而可以支持多个视频编码标准;采用了基于SIMD单指令多数据流技术,实现滤波数据全并行运算,使硬件高度规整,易于芯片布局布线;设计了1个4级可配置的流水线,重构为不同视频标准的去块滤波器,复用硬件资源,提高了硬件利用率和系统数据吞吐量。用这种架构实现了1个同时支持H264、AVS、VP8、RealVideo4种标准的多标准去块滤波加速器,时钟频率为200MHz,能够用于多标准高清视频的实时滤波处理。
县域经济评价理论创新与体系构建
常春光,
科技进步与对策 , 2011,
Abstract: 为提高县域经济发展水平评价的精确性,研究了县域经济评价的理论创新机制与体系构建,界定了县域经济评价理论创新的内涵与体系构建的特征,给出了基于理论创新的县域经济评价理论体系框架。在理论创新中,研究了县域经济评价理论创新的驱动力、模式与内容。在体系构建中,研究了基于理论创新的县域经济评价目标与定位、评价原则、评价理论依据与方法、评价的操作环节,为县域经济评价实践提供理论依据。理论创新县域经济体系构建评价方法
多机器人编队控制研究进展 Research development of multi-robot formation control
,李擎
- , 2018,
Abstract: 首先介绍了传统的编队控制方法的定义、特点和常用方法及优缺点,并将传统编队控制时代定义为前编队控制时代.随着多智能体技术的发展,将多智能体技术引入到编队控制问题中,诞生了众多新的研究成果,称为后编队控制时代.后编队控制时代以多智能体技术为基础,随着通信技术、计算机技术、人工智能技术的发展而逐渐壮大起来,并受到了学者的广泛关注.前编队控制时代强调多机器人通过编队协作完成单个机器人无法实现的任务,提高任务完成效率且缩短任务完成时间.后编队控制时代则是在前编队控制时代的基础上,更强调低成本、同步性和协同性,但却不那么重视每个个体的任务分工,甚至是按照规则自由分配任务,不再有"不可替代"的个体存在.最后给出了研究编队控制问题的基本思路和目前尚待解决的关键问题.
基于双角度aatsr遥感数据的组分温度反演
,
遥感技术与研究 , 2014,
Abstract: 以甘肃省张掖绿洲为研究区域,基于双角度、多光谱aatsr数据,利用土壤—植被线性混合辐射传输模型反演了张掖绿洲整个生长季的植被和土壤组分温度,并对aatsr不同观测角度间配准前后反演的组分温度结果进行了比较。结果表明:在利用双角度数据进行组分温度反演时,不同观测角度间的配准对反演结果的影响不容忽视。进一步利用机载widas观测数据反演的盈科附近植被与土壤组分温度及盈科站实测的地表辐射温度对aatsr数据反演得到的组分温度进行了验证,结果表明基于aatsr双角度数据和土壤—植被线性混合模型的结合反演得到的组分温度具有合理的时间和空间变化趋势,也能够较好地反映张掖绿洲植被生长以及组分温度的变化趋势。
在规范管理中释放科研生产力:经费管理的国际比较
林拓,,
- , 2016, DOI: 10.16382/j.cnki.1000-5560.2016.04.010
Abstract: 摘要 在国家发展从要素驱动转向创新驱动的背景下,经费对科研创新支撑的重要性与日俱增,严格科研经费管理也成为共识,因而,科研经费的管理面临着刚性严格规制与柔性创新激发的两难选择。基于国际比较的研究发现,破解难局的关键在于,既要在尊重科研规律的基础上强化经费管理,又要在规范管理中促进科研创新,由此形成三种基本类型:一是预防型,重在经费使用者的自律与使用活动的监督;二是全成本型,以科研创新主体及创新活动的全成本核算为标准,明确科研成本补偿机制;三是绩效型,以经费使用绩效为核心,聚焦科研成果创新与转化。三者互动交织构成有机整体,从而在经费规范管理中释放科研生产力。
Abstract: How to activate research productivity by standardized fund management is discussed in the fifth paper. China's development is driven by innovation rather than by elements, and the importance of funding scientific researches and innovation is growing. However, the dilemma is how to deal with rigid fund regulations and the flexible innovation excitation. Based on international experience, the authors propose that the key solution is not only to strengthen budget management and follow the rules of scientific research, but also to establish a new system to facilitate the scientific researches and innovation.
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